You have been granted access, use your keyboard to continue reading.Several new start-ups are building replicas of sites so A.I. can learn to use the internet and maybe replace white-collar workers.John Qian, a co-founder of Matrices. The new shadow sites are part of the tech industry’s efforts to transform today’s chatbots into A.I. agents.Credit...Video by Cayce Clifford For The New York TimesSilicon Valley Builds Amazon and Gmail Copycats to Train A.I. AgentsSeveral new start-ups are building...